My ultimate Rides dash that I ordered through AZ-Nick literally just arrived less than an hour ago and looks really good. For me having to deal with shipping my core to CA if I chose Just Dashes and then for return shipping, along with UR's lower price, made the choice to go with UR vs. Just Dash's product an easy one for me. I saved over $300. But if you live close enough to JD to drop off and pick up that would certainly tend to give an advantage back to them.
Looking at the UR dash compared to my core, it looks like the grain pattern may be slightly fainter, other than that, I see no difference. I hear people complain that Just Dashes products are "too puffy" and that is most noticable by the recess for the VIN tag.
A friend of mine who lives near me and put an Ultimate Rides dashpad in his '70 cuda let me take a close look at his dash a few months ago before I decided to go with Nicks group buy and get UR. He told me that installing his UR dash a few years ago involved a lot of trimming to make it fit. It looked pretty good in his car.
The opinion I have got watching posts on this subject over the years and the opinion I seem to get from them is that Ultimate Rides keeps getting a little better and Just Dashes stays the same or gets a bit worse.
I've taken the pad out of my T/A a few times and reinstalled once, and it wasn't a bad job. I didn't take out a windshield or anything, just crawled under the dash and worked away at it.
I have heard that the job is much easier if you actually drop the steering column, and remove the nuts so that you can tilt or actually remove the dash frame. I haven't done that so I can't speak first hand.
I was working on the dash pad on my T/A which is a low option car. My convertible on the other hand, is loaded with 3 speaker dash, AC, etc. Its pad is cracked and every year I tell myself when I go to store the car for the winter, I will remove the pad, and send out to JD to get restored. Then when fall comes I take a look at it and loose my enthusiasm! With all the AC ducting and speaker wires and such, it looks like a job from hell!